\\[-1.8ex] Soil Heterogeneity & $-$3.364$^{***}$ & $-$0.043$^{*}$ & $-$0.282$^{*}$ & $-$0.436$^{***}$ & $-$0.050$^{**}$ & $-$0.002 & 0.036 \\ 
  & (0.811) & (0.024) & (0.155) & (0.146) & (0.019) & (0.016) & (0.157) \\ 
  & & & & & & & \\ 
Observations & 21,090 & 21,083 & 20,986 & 17,893 & 21,100 & 21,175 & 19,493 \\ 
R$^{2}$ & 0.553 & 0.817 & 0.326 & 0.405 & 0.386 & 0.674 & 0.609 \\ 
